Wavelength dependence of laser plasma interaction related to shock ignition approach

Year: 2018

Authors: Pisarczyk T.; Gus’kov S. Yu; Dudzak R.; Renner O.; Batani D.; Chodukowski T.; Rusiniak Z.; Dostal J.; Demchenko N. N.; Rosinski M.; Parys P.; Smid M.; Korneev Ph; Krousky E.; Borodziuk S.; Badziak J.; Antonelli L.; Gizzi L.; Cristoforetti G.; Koester P.; Maheut Y.; Volpe L.; Baffigi F.; Levato T.; Skala J.; Zaras-Szydlowska A.; Trela J.; Mancelli D.; Ullschmied J.; Pfeifer M.; Juha L.; Krus M.; Hrebicek J.; Medrik T.; Jungwirth K.; Krupka M.; Pisarczyk P.

Autors Affiliation: Institute of Plasma Physics and Laser Microfusion, Warsaw, 01-497, Poland; P. N. Lebedev Physical Institute of RAS, Moscow, 119991, Russian Federation; National Research Nuclear University MEPhI, Moscow, 115409, Russian Federation; Institute of Physics, Czech Academy of Sciences, Prague, 182 21, Czech Republic; Institute of Plasma Physics, Czech Academy of Sciences, Prague, 182 00, Czech Republic; Universite Bordeaux, CNRS, CEA, CELIA, Talence, France; Universita di Roma la Sapienza, Rome, Italy; York Plasma Institute, University of York, York, United Kingdom; Warsaw University of Technology, ICS, Warsaw, 00-661, Poland

Abstract: This paper provides a summary of recent research connected with the shock ignition (SI) concept of the inertial confinement fusion which was carried out at PALS. In the experiments, Cu planar targets coated with a thin CH layer were used. Two-beam irradiation experiment was applied to investigate the effect of preliminary produced plasma to shock-wave generation. The 1 omega or 3 omega main beam with a high intensity >10(15) W/cm(2) generates shock wave, while the other 1 omega beam with the intensity below 10(14) W/cm(2) creates CH pre-plasma simulating the pre-compressed plasma related to SI. Influence of laser wavelength on absorbed energy transfer to shock wave was studied by means of femtosecond interferometry and measuring the crater volume. To characterize the hot electron and ion emission, two-dimensional (2D) K-alpha-imaging of Cu plasma and grid collector measurements were used. In single 1 omega beam experiments energy transport by fast electrons produced by resonant absorption made a significant contribution to shock-wave pressure. However, two-beam experiments with 1 omega main beam show that the pre-plasma is strongly degrading the scalelength which leads to decreasing the fast electron energy contribution to shock pressure. In both the single 3 omega beam experiments and the two-beam experiments with the 3 omega main beam, do not show any clear influence of fast electron transport on shock-wave pressure. The non-monotonic behavior of the scalelength at changing the laser beam focal radius in both presence and absence of pre-plasma reflects the competition of plasma motion and electron heat conduction under the conditions of one-dimensional and 2D plasma expansion at large and small focal radii, respectively.


Volume: 36 (3)      Pages from: 405  to: 426

More Information: This work has been carried out within the framework of the EUROfusion Enabling Research Project: AWP17-ENR-IFE-CEA-01 “Preparation and Realization of European Shock Ignition Experiments” and has received funding from the Euratom research and training programme 2014-2018 under grant agreement no. 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission. The work was also supported by the European Union LASERLAB IV project (Grant Agreement No. 654148), by the Russian Foundation for Basic Research under the Project No. 17-02-00059, by the MEPhI Academic Excellence Project (contract no. 02.a03.21.0005, 27.08.2013), by the Czech Ministry of Education, Youth and Sports, project LD14089 and projects LM2010014 and LM2015083 (PALS RI), and by the Czech Science Foundation, Project No. P205/11/P712. The authors also acknowledge support from the project High Field Initiative (HiFI) (CZ.02.1.01/0.0/0.0/15 003/0000449) and ELI Tools for Advanced Simulation (ELITAS) (CZ.02.1.01/0.0/0.0/16013/0001793), both from European Regional Development Fund. Finally, the authors are grateful to the PALS staff for help in running the experiments.
E stato pubblicato in seguito il seguente CORRIGENDUM Laser and Particle Beams , Volume 36 , Issue 4 , December 2018 , pp. 514 https://doi.org/10.1017/S0263034619000016 Le correzioni riguardano le affiliazioni degli autori. ( In the original publication of this article, multiple affiliations were missing and several authors were not properly linked to their affiliations. The above list consists of the correct affiliations, and the original article has been updated to reflect the changes. The authors apologize for the errors.)
KeyWords: Electron energy levels; Electron transport properties; Energy transfer; Heat conduction; Inertial confinement fusion; Interferometry; Laser beams; Laser fusion; Laser produced plasmas; Plasma shock waves; Shock waves, Absorption mechanisms; Fast electrons; Femtoseconds; Inertial fusion; Resonant absorption; Shock ignitions, Beam plasma interactions
DOI: 10.1017/S0263034618000447

Citations: 5
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